package com.oodso.sell.utils;

import com.oodso.sell.model.util.HttpConstans;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * 项目名称：sell
 * 类描述：
 * 创建人：资拥
 * 创建时间：16/10/26 下午3:34
 * 修改人：资拥
 * 修改时间：16/10/26 下午3:34
 * 修改备注：
 */
public class AESOperatorUtil {

    /*
    * 加密用的Key 可以用26个字母和数字组成
    * 此处使用AES-128-CBC加密模式，key需要为16位。
    */
    private String ivParameter = "bf1*22f^e9873e49";
    private String sKey = HttpConstans.APP_SERCET.substring(0, 16);
    private String deKey = HttpConstans.APP_SERCET_DUOSHU.substring(0, 16);
    private static AESOperatorUtil instance = null;


    private AESOperatorUtil() {

    }


    public static AESOperatorUtil getInstance() {
        if (instance == null) {
            instance = new AESOperatorUtil();
        }
        return instance;
    }


    // 加密
    public String encrypt(String sSrc) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
        byte[] raw = HttpConstans.APP_SERCET.substring(0, 16).getBytes();
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter
                .getBytes());//使用CBC模式，需要一个向量iv，可增加加密算法的强度
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
        return new BASE64Encoder().encode(encrypted);//此处使用BASE64做转码。
    }


    // 解密
    public String decrypt(String sSrc) throws Exception {
        try {
            byte[] raw = sKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = new BASE64Decoder()
                    .decodeBuffer(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }

    // 解密
    public String decrypt2(String sSrc) throws Exception {
        try {
            sSrc = sSrc.replace('*', '+').replace('-', '/').replace('.', '=');

            byte[] raw = deKey.getBytes("ASCII");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] encrypted1 = new BASE64Decoder()
                    .decodeBuffer(sSrc);//先用base64解密
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original, "utf-8");
            return originalString;
        } catch (Exception ex) {
            return null;
        }
    }

}
